WorldPay (Offsite) payment gateway

Shopify supports WorldPay (Offsite) to accept payments in Australia

The WorldPay Offsite payment gateway has payment processing
solutions suitable to small, medium and even enterprise level
businesses. From multi-currency and multi-payment capabilities, to
fast, flexible and adaptable systems, WorldPay Offsite lets
merchants accept credit card payments through a redirect to a
hosted third party URL, which then automatically takes users back
to your Shopify store.
Shopify supports the best payment gateways around the world,
making it quick and simple for our customers to set up and run
their ecommerce shops on our platform using the payment gateways
of their choice.